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After we created the site, Brian reported that his team was using the site proficiently, and his e-mail volume had ramped way down. However, Brian was still receiving e-mails asking about the scheduling of issues. Specifically, managers wanted to know what tasks were scheduled to be completed in the next three days so they could ensure that subject matter experts would be available if the developers had last-minute questions. A Tasks in the Next Three Days view would lower anxiety. This view requires two filter criteria. The estimated completion date, Est Compl, needs to be greater than or equal to today, and less than or equal to the date three days from now (today + 3). You can t use [TODAY] in a filter calculation such as the following:

Once again, process is used to start an on-demand or polling process. In this case, a polling data process. A polling process is one that does its thing, goes to sleep, and then wakes up to do its thing all over again and again. A polling process is dependent on a queue, at the very least, so you can tell the process to quit executing. The queue can also be used to indicate what needs to be processed. For example, if you have a long-running process that must take place as part of inserting an entry into a particular table, you could have a trigger on that table insert a row into a polling process s queue, like

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The SymmetricCrypt class has two static methods, Encrypt() and Decrypt(), which encrypt and decrypt data, and a number of encryption configurations parameters stored as static members: // Encryption/decryption key private static $_msSecretKey = 'From Dusk Till Dawn'; // The initialization vector private static $_msHexaIv = 'c7098adc8d6128b5d4b4f7b2fe7f7f05'; // Use the Rijndael Encryption Algorithm private static $_msCipherAlgorithm = MCRYPT_RIJNDAEL_128; The secret key is 16 characters (bytes) long for AES algorithms. Using a smaller key is allowed by the mcrypt library but will reduce the encryption security. The IV should be exactly 16 bytes long for AES and will be kept as a hexadecimal string (2x16=32 chars long). Both $_msSecretKey and $_msHexaIv variables are set to temporary values here. They could just as easily take any other values, depending on the key you want to use. Encrypt() starts by converting the IV from its hexadecimal value to a byte array because this is the format expected by the mcrypt_encrypt function (the one that does the actual encryption): // Pack SymmetricCrypt::_msHexaIv into a binary string $binary_iv = pack('H*', self::$_msHexaIv); The conversion is done using PHP s pack function (learn more about it at http://www.php.net/pack). The call to mcrypt_encrypt follows: // Encrypt $plainString $binary_encrypted_string = mcrypt_encrypt( self::$_msCipherAlgorithm, self::$_msSecretKey, $plainString, MCRYPT_MODE_CBC, $binary_iv); This is the call that performs the actual encryption. Its parameters are obvious, and you can find more detail about the mcrypt_encrypt function at http://www.php.net/mcrypt. The MCRYPT_MODE_CBC specifies the cipher block chaining encryption method; this method uses a chaining mechanism in which the encryption of

a primary key ID value, and then have the polling process finish the long-running process asynchronously. The following is an example of a polling process that you can find in package POLLING_PROCESS: PROCEDURE process is r_polling_process_queue POLLING_PROCESS_QUEUE%ROWTYPE;

each block of data depends on the encryption results of preceding blocks, except for the first block in which the IV is used instead. At the end, the encrypted string is transformed into hexadecimal format, which is easier to work with (for example, to save in the database or in a configuration file): // Convert $binary_encrypted_string to hexadecimal format $hexa_encrypted_string = bin2hex($binary_encrypted_string); The Decrypt() method is very similar to the Encrypt() method. First, you need the IV to be in a binary form (the same first step you took in the Encrypt() method). As the Encrypt() method returns the encrypted string as a hexadecimal string, the input parameter of Decrypt() is also a hexadecimal string. You must convert this string to a byte array, which is the format that mcrypt_decrypt needs: // Convert string in hexadecimal to byte array $binary_encrypted_string = pack('H*', $encryptedString); // Decrypt $binary_encrypted_string $decrypted_string = mcrypt_decrypt( self::$_msCipherAlgorithm, self::$_msSecretKey, $binary_encrypted_string, MCRYPT_MODE_CBC, $binary_iv); return $decrypted_string; The test_encryption.php test file for this class simply encrypts and decrypts data, demonstrating that things are working properly. The code for this is very simple, so we won t detail it here. Now that you have the SymmetricCrypt class code, the last step in creating the security-related classes is to add the SecureCard class.

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